EP 0423941 A2 19910424 - Variable frequency signal generator.
Title (en)
Variable frequency signal generator.
Title (de)
Generator mit variablem Frequenzsignal.
Title (fr)
Générateur à signal de fréquence variable.
Publication
Application
Priority
GB 8923674 A 19891020
Abstract (en)
A variable frequency signal generator includes a phase locked loop having a variable frequency oscillator (1) which has a control port to which a frequency determining signal is applied, the output of the oscillator being fed via a frequency divider (6) to a phase sensitive detector (7) where it is compared with a reference frequency signal, the result of said comparison being arranged to generate a comparison signal which is fed to a loop filter (9) which is coupled to said control port; and the signal generator including means for applying a frequency control signal thereto comprising a first path being arranged to adjust the division ratio of the frequency divider (6), and a second path including means for combining said frequency control signal and said comparison signal to produce said frequency determining signal; and calibration means (11-14) for adjusting the relative characteristics of said first and second paths to compensate for effects arising from tuning sensitivity dependence on frequency of said variable frequency generator (1).
IPC 1-7
IPC 8 full level
H03B 23/00 (2006.01); H03C 3/09 (2006.01); H03C 3/06 (2006.01)
CPC (source: EP US)
H03B 23/00 (2013.01 - EP US); H03C 3/0925 (2013.01 - EP US); H03C 3/0933 (2013.01 - EP US); H03C 3/0941 (2013.01 - EP US); H03C 3/095 (2013.01 - EP US); H03C 3/0991 (2013.01 - EP US); H03B 2200/0092 (2013.01 - EP US); H03C 3/06 (2013.01 - EP US); H03C 2200/0029 (2013.01 - EP US); H03C 2200/005 (2013.01 - EP US); H03C 2200/0079 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0423941 A2 19910424; EP 0423941 A3 19910529; EP 0423941 B1 19971126; DE 69031756 D1 19980108; DE 69031756 T2 19980319; GB 2237157 A 19910424; GB 8923674 D0 19891206; US 5079522 A 19920107
DOCDB simple family (application)
EP 90310223 A 19900919; DE 69031756 T 19900919; GB 8923674 A 19891020; US 59667590 A 19901012